Differences in Glock 19 Mag Followers?

[mountainclmbr]

The AWB ended for me today. I bought 2 Glock 19 15 rd drop free magazines. Afterward I noticed one is marked "LE/GOVT ONLY" and the other is unmarked. The price was $23 each. I was looking more closely and noticed one (LE/GOVT) has a follower marked "9mm 4" and the other is marked "9mm 3". There are differences in the shapes. I had a pre-ban 15 rd non-drop free and saw that the follower is unmarked.

Does anyone know why the differences and any functional variations between the mag followers?

 

[Tecolote]

For standard cap mags they go in order from 9mm1 to 9mm4. The differences are the height that the rounds feed into the ramp. As long as you don't have any 2183s, the followers for the ten round mags, you're good to go.